Who does it, who helps them and why it's spreading.
Going online in countries where internet censorship is common is rather like visiting a parallel universe run by the world's strictest, most bigoted parents. Entire sites disappear without warning.
YouTube is frequently blocked for hosting content that some regimes don't want their citizens to see, and online translation services, blogging platforms and even VoIP utilities like Skype often fall foul of censors.
Local sites are also very selective about what they publish or link to. Bloggers rot in jails for daring to criticise politicians or religious leaders, while millions of people are denied internet access altogether, limited to an incredibly narrow selection of officially approved pages or subjected to constant and chilling levels of surveillance.
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